E
- the type of the objects being permutedjava.util.Iterator<java.util.List<E>>
public class PermutationIterator<E>
extends java.lang.Object
implements java.util.Iterator<java.util.List<E>>
The iterator will return exactly n! permutations of the input collection.
The remove()
operation is not supported, and will throw an
UnsupportedOperationException
.
NOTE: in case an empty collection is provided, the iterator will return exactly one empty list as result, as 0! = 1.
Constructor | Description |
---|---|
PermutationIterator(java.util.Collection<? extends E> coll) |
Standard constructor for this class.
|
Modifier and Type | Method | Description |
---|---|---|
boolean |
hasNext() |
Indicates if there are more permutation available.
|
java.util.List<E> |
next() |
Returns the next permutation of the input collection.
|
void |
remove() |
public PermutationIterator(java.util.Collection<? extends E> coll)
coll
- the collection to generate permutations forjava.lang.NullPointerException
- if coll is nullpublic boolean hasNext()
hasNext
in interface java.util.Iterator<E>
public java.util.List<E> next()
next
in interface java.util.Iterator<E>
java.util.NoSuchElementException
- if there are no more permutationspublic void remove()
remove
in interface java.util.Iterator<E>
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